http://llvm.org/bugs/show_bug.cgi?id=5438
Summary: Small example where gcc produces better code
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
>From the Felix von Leitner talk:
int bar(int a,int b) {
return (a<0) == (b<0);
}
gcc-4.4 gives (x86-64):
movl %edi, %eax
notl %eax
xorl %esi, %eax
shrl $31, %eax
ret
llvm-gcc gives:
testl %edi, %edi
setns %al
testl %esi, %esi
sets %cl
xorb %al, %cl
movzbl %cl, %eax
ret
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